body{
    font-family:Arial,Helvetica,sans-serif;
    margin-left: auto;
    margin-right: auto;
    margin-top: 30px;
    width: 1000px;
}
#top{
    width: 1000px;
    height:150px;
    background-color:#BBB;
}
#left{
    float:left;
    width: 260px;
    height:500px;
    background-color:#DDD;
}
#content{
    float:right;
    width:680px;
    height:500px;
    background-color:#AAA;
}

